3rd gen honda header
 

Where could i find an aftermarket header for a A20A in my '89 honda accord lx?

junk yard, e-bay :shrug:

Going to be hard to find a new one. The thing is ~28 years old and there isn't much aftermarket "performance" support for the 3rd gen's. Heck, finding a "new" OE manifold would be almost impossible.

It was worth a try to ask. I'd like to k20 swap it when the motor bites the dust (it currently has 247k)